DIY Audio Analyzer with AK5397/AK5394A and AK4490

[AKN]

Kevinkr,
Please note that I do not "expect" a new MB for free. Where have I said that?

 

[kevinkr]

I know you did not mention "free" still despite not mentioning it expectations are not always clear - some may have other, less reasonable expectations (only in my opinion BTW) and it was more of a general comment about expectation and risk and I am not speaking for Jens either.

 

[AKN]

Ok, I wasn't specific enough.

But I can tell you (and others) that I regard Jens effort highly. His fast 'patch' speaks for itself in dedication for his customers (us).

 

[kevinkr]

Me too, and I have stepped in on a few occasions where I was concerned things might get out of hand, that clearly was not required in this case.

 

[soongsc]

Having pledged a bunch of Kickstarter projects, I have an open mind for these things. But it would be interesting to see if the Autoranger type design to get into production units. Which reminds me to find out how mine is coming along.

 

[anatech]

As long as the instructions are clear when the patch PCB arrives, I'm good to do the work. A couple pictures showing the work progressing would be helpful too.

Sounds like I should put the smd tip on my iron for this.

-Chris

 

[bk856er]

A little DIY on this is A-OK with me!


BK

 

[mbrennwa]

Mine was delayed because I went on a trip just as it was about to be shipped so mine can be reworked at the factory if that is preferable. I'm capable of doing the retrofit if required, but it makes sense to wait a bit I'd say.

+1.

I am in the same boat!

 

[diyaudnut]

I will just wait for Jens to finish his investigations and post what options are available for resolution.

 

[B&W_arthur]

I received a mail with a DHL tracking ID "AWB+10_digit_number" that doesn't work, but tracking works if I remove the AWB prefix.

Great! How come you know how to decipher the code.

Anyway, I received my analyzer this afternoon.

I am rubbing my hands to give it a loop back test.

 

[cwtim01]

I received my unit today and did a quick loopback test. The THD are similar to what nyt has posted here, but the THD+N is somewhat not as good. Not sure if it's due to the measurement settings, the PC or the RTX6001 unit I have.

Attached also the loopback measurement of my soundcard (Lynx Hilo) for comparison, the Lynx is a pretty good soundcard already, but the RTX6001 is beating the THD of the Lynx by more than 7dB.

 

[kannan_s]

I did try to the loop back and not getting these as I am finding large amount noise. I am wondering what is that I am not setting correctly? - The setting are exactly shown in CTW in my case

When I try Audio Tester - I am getting better THD+N nut it does not show the noise separately?

i am using balanced cables for loop back and 10 V output /10 V input as well as 1V range
In REW I am not able to see clean spectrum even after using the bandwidth. Audi Tester the figure is the best for the range setting. My RMA is crashing ( WIN 10 ) on Surface Book?
yet to try other software.

 

[kevinkr]

I did try to the loop back and not getting these as I am finding large amount noise. I am wondering what is that I am not setting correctly? - The setting are exactly shown in CTW in my case

I think it is your amplitude scaling, look at how others have set their vertical range. It looks good to me.

 

[lemon]

I received my unit today and did a quick loopback test. The THD are similar to what nyt has posted here, but the THD+N is somewhat not as good. Not sure if it's due to the measurement settings, the PC or the RTX6001 unit I have.
....

There is a small difference btw yours and nyt tests, the frequency was 1.000Hz vs 1.000,05Hz (nyt).
I don't remember the REW well, but it is very important the signal level that produce the generator.
I don't know if the nyt's signal level was 0dB or -1dB or else.
Also, it must clarify what output and input are used on RTX and of course what attenuation level, for comparison reasons.

 

[nyt]

There is a small difference btw yours and nyt tests, the frequency was 1.000Hz vs 1.000,05Hz (nyt).
I don't remember the REW well, but it is very important the signal level that produce the generator.
I don't know if the nyt's signal level was 0dB or -1dB or else.
Also, it must clarify what output and input are used on RTX and of course what attenuation level, for comparison reasons.

Mine was at 0/0. My graphs were at -5 and -15, which were the best cases for THD+N and THD.

 

[kannan_s]

I was trying different settings. The graph was taken using 1.0V out and 1.0V in. I also tried 10V out and 10 V in. My problem is the noise seen in REW. However Audio tester does not show such a noise?
I will try to test in another room away from this room where I have my Router/Fridge ?
kannan
attached is the 10V in/out plot in REW

 

[kannan_s]

Question is how to validate the performance of the RTX ? I will like to know what are the tests done prior to shipping ? We are seeing almost similar range of performance in the loop back test. Hope more testing is done on this equipment to validate all areas of use.

 

[JensH]

I managed to build and test a small add-on board today. The circuit works as intended and solves the problem with high levels of distortion. See attached measurement report.

Tomorrow I will look further at the logistics in this: when can we have PCB's and have them mounted?

 

[TNT]

Did you also repeat at low level to see that the other end of the scale was not affected by the mod?

//

 

[JensH]

Not really, because the modification makes no difference in that case.